My friends 67 mustang needs a motor rebuild on it original 289, but we were thinking that we want to drop in a 351 cleveland 2v engine in it that I have. I would like to know what are some of the issues that we might have to resolve. I was wondering if it would bolt on to the stock auto trans amd if we are going to need to mess around with the motor mounts, exhaust, radiator or hood. The 351C I have was has a flywheel for manual so I know that Im going to need a new flex plate for the auto trans, I just dont know what weight should be on the flexplate. I would love to hear your opinion on this it will help me allot. Thanks